Open Stack

Your custom image is likely missing the virtIO drivers that the cloud image
has.

Instead of running through the DVD installer, I'd suggest checking out
diskimage-builder to make custom images for use on Openstack.

On Tue, Aug 1, 2017 at 10:16 AM Paras pradhan <pradhanparas at gmail.com>
wrote:

> Also this is what I've noticed with the centos cloud image I downloaded.
> If I add few packages( around a GB), the sizes goes up to 8GB from 1.3 GB.
> Running dd if=/dev/zero of=temp;sync;rm temp failed due to the size of
> the disk on the cloud images which is 10G. zeroing failed with No space
> left on device.  Any other options?
>
> Thanks
> Paras.
>
> On Tue, Aug 1, 2017 at 9:43 AM, Paras pradhan <pradhanparas at gmail.com>
> wrote:
>
>> I ran virt-sparsify. So before running virt-sparsify it was 6.0GB and
>> after it is 1.3GB.
>>
>> Thanks
>> Paras.
>>
>> On Tue, Aug 1, 2017 at 2:53 AM, Tomáš Vondra <vondra at homeatcloud.cz>
>> wrote:
>>
>>> Hi!
>>>
>>> How big are the actual image files? Because qcow2 is a sparse format, it
>>> does not store zeroes. If the free space in one image is zeroed out, it
>>> will convert much faster. If that is the problem, use „dd if=/dev/zero
>>> of=temp;sync;rm temp“ or zerofree.
>>>
>>> Tomas
>>>
>>>
>>>
>>> *From:* Paras pradhan [mailto:pradhanparas at gmail.com]
>>> *Sent:* Monday, July 31, 2017 11:54 PM
>>> *To:* openstack-operators at lists.openstack.org
>>> *Subject:* [Openstack-operators] custom build image is slow
>>>
>>>
>>>
>>> Hello
>>>
>>>
>>>
>>> I have two qcow2 images uploaded to glance. One is CentOS 7 cloud image
>>> downloaded from centos.org.  The other one is custom built using CentOS
>>> 7.DVD.  When I create cinder volumes from them, volume creation from the
>>> custom built image it is very very slow.
>>>
>>>
>>>
>>>
>>>
>>> CenOS qcow2:
>>>
>>>
>>>
>>> 2017-07-31 21:42:44.287 881609 INFO cinder.image.image_utils
>>> [req-ea2d7b12-ae9e-45b2-8b4b-ea8465497d5a
>>> e090e605170a778610438bfabad7aa7764d0a77ef520ae392e2b59074c9f88cf
>>> 490910c1d4e1486d8e3a62d7c0ae698e - d67a18e70dd9467db25b74d33feaad6d
>>> default] *Converted 8192.00 MB image at 253.19 MB/s*
>>>
>>>
>>>
>>> Custom built qcow2:
>>>
>>> INFO cinder.image.image_utils [req-032292d8-1500-474d-95c7-2e8424e2b864
>>> e090e605170a778610438bfabad7aa7764d0a77ef520ae392e2b59074c9f88cf
>>> 490910c1d4e1486d8e3a62d7c0ae698e - d67a18e70dd9467db25b74d33feaad6d
>>> default] *Converted 10240.00 MB image at 32.22 MB/s*
>>>
>>>
>>>
>>> I used the following command to create the qcow2 file
>>>
>>> qemu-img create -f qcow2 custom.qcow2 10G
>>>
>>>
>>>
>>> What am I missing ?
>>>
>>>
>>>
>>> Thanks
>>> Paras.
>>>
>>>
>>>
>>>
>>>
>>
>>
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